View Compilation Error

451260_0_0_16999.cpp
451260_0_0_16999.cpp(23) : error C2668: “log” : 对重载函数的调用不明确
        VC\include\math.h(612): 可能是“long double log(long double)”
        VC\include\math.h(564): 或       “float log(float)”
        VC\include\math.h(193): 或       “double log(double)”
        试图匹配参数列表“(__int64)”时
451260_0_0_16999.cpp(23) : error C2668: “log” : 对重载函数的调用不明确
        VC\include\math.h(612): 可能是“long double log(long double)”
        VC\include\math.h(564): 或       “float log(float)”
        VC\include\math.h(193): 或       “double log(double)”
        试图匹配参数列表“(int)”时